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Most soils are naturally quite fertile, but to maintain this fertilizers are sometimes needed. Organic and inorganic fertilizers contain a range of nutrients in different proportions. In most soils the nutrients that need to be added regularly are nitrogen for vigorous growth, phosphorus phosphate to encourage flowering and fruiting, and potassium potash for strong roots.

The fertilizer packaging usually indicates the proportions under the chemical symbols and PK. A balanced fertilizer contains roughly equal portions of the three main nutrients; a complete fertilizer also contains equal amounts of N. P. and K but also includes a range of other minerals, too. At certain stages in a plants life a fertilizer rich in a particular nutrient may be more appropriate.

Inorganic fertilizers may be your only option in a small garden where it may not be possible to store bulky organic fertilizers. Inorganic fertilizers can be combined with homemade compost.

Bulky organic fertilizers, such as well-rotted compost improve the soil by adding important trace elements to instantly help improve soil structure.

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